Proterra Announces the Largest-Ever U.S. Order of
Altoona-Tested Electric Buses

GREENVILLE, SC--September 7, 2013: Proterra Inc.,
the leading provider of zero-emission battery electric
transit solutions, has completed the largest-ever U.S. sale of
Altoona-tested heavy-duty electric buses to Foothill Transit, a joint
powers authority of 22 member cities in the San Gabriel and Pomona
Valleys in Southern California. In 2011, Foothill Transit became the
first transit agency in the United States to use on-route charge
electric buses by purchasing and operating Proterra buses. Based on
strong performance and return on investment of those vehicles, the
agency has decided to purchase an additional 12 buses from Proterra
to
completely electrify its 291 route, which travels between LaVerne and
Pomona.

“These electric buses have more than delivered
on our expectations in terms of cost savings and sustainability.
We're
looking forward to launching our--and our
region's--first all-electric bus
line. This is the future of zero-emission buses, and we're proud to
be
on board.”

Although popular throughout the United States for reduced cost of
ownership and sustainability, zero-emission electric buses are of
particular interest in California, where there are many environmental
non-attainment zones and California Air Resource Board (CARB)
regulations in play.

"The Foothill Transit order is a clear vote of
confidence and
confirmation that Proterra buses truly deliver the lowest total cost
of
ownership and smallest carbon footprint of any transit bus on the
market," said Garrett Mikita, president and chief executive
officer,
Proterra Inc. "Foothill Transit was our first customer
and the first
U.S. transit agency to go electric with on-route charging, so we are
thrilled that they have seen the value of expanding their electric
fleet
and will use Proterra buses to do so."

The Foothill Transit sale is the latest in a wave of new orders for
Proterra, with the company's last three sales to
transit systems coming
from repeat customers. Recently, StarMetro of Tallahassee purchased
an
additional three EV buses from Proterra, increasing their EV fleet
size
to five, and the Worcester Regional Transit Authority in
Massachusetts
doubled its initial three bus order to six.

"We had high hopes when we first made the decision to
use these
innovative fast-charge EV buses," said Foothill Transit
executive
director, Doran Barnes. "These electric buses have more
than delivered
on our expectations in terms of cost savings and sustainability.
We're
looking forward to launching our--and our
region's--first all-electric bus
line. This is the future of zero-emission buses, and we're proud to
be
on board."

To keep pace with this growing demand, Proterra has doubled its
production workforce, installed a second production line, added a
second
shift and grown its sales staff significantly.